Shooting .223 and .556 rounds

I've heard that myth for ever that you can only fire a .223 out of a .556 but you cannot fire a .556 out of a .223 or such.

But this is bogus, they are the exact same round.

So people say that well it's the pressure, the pressure is higher in the .556 round than the .223 because of the smaller interior space, but this won't matter at all when firing your .556 in a .223 chamber.

There is absolutely no difference in the dimensions of the brass so unless you load a .223 quantity in a .556 casing you'll have no problem and even then at most you'll just risk blowing the casing which isn't usually a significant problem, persay.

But what buffoon is going to load that much powder in the .556 round? Come on.

5.56 is loaded hotter. That along with a .223 barrel having a shorter leade, leads to increase pressure. It isn't recommended to shoot 5.56 out a .223 barrel for safety precautions. When it comes to firearms, I always make sure to take all safety precautions available to me. Not something I want to take a chance with.

* Problems may occur when firing the higher-pressure 5.56mm cartridge in a .223 chamber with its much shorter leade. It is generally known that shortening the leade can dramatically increase chamber pressure. In some cases, this higher pressure could result in primer pocket gas leaks, blown cartridge case heads and gun functioning issues.

No difference in cartridge case dimensions, they are identical. Rather it is the throat lead dimensions that are different in the chambering of the rifle, the 5.56 NATO is throated for military ammunition, the .223 Remington is throated for commercial ammo like you buy on the shelves (differences in bullet lengths/weights). The chambers are different , ones civilian and one is military, one throat is just more optimized for one specific type of ammo. The ammo is actually interchangeable.

5.56 is loaded hotter. That along with a .223 barrel having a shorter leade, leads to increase pressure. It isn't recommended to shoot 5.56 out a .223 barrel for safety precautions. When it comes to firearms, I always make sure to take all safety precautions available to me. Not something I want to take a chance with.

What common rifles use a .223 chambering anyways? Whenever i was shopping for an upper for my frankengun i put together over the summer. Not 1 Ar I saw was .223 chambered. Perhaps a boltgun, but theres better options then .223 for varmint in that case.

What common rifles use a .223 chambering anyways? Whenever i was shopping for an upper for my frankengun i put together over the summer. Not 1 Ar I saw was .223 chambered. Perhaps a boltgun, but theres better options then .223 for varmint in that case.

You kinda answered your own question. The AR platform has another variation the Wylde chamber, not sure the specifics, but its to do with the leade. The .223 is extremely popular for varmint hunting.

You kinda answered your own question. The AR platform has another variation the Wylde chamber, not sure the specifics, but its to do with the leade. The .223 is extremely popular for varmint hunting.

It the AR platform it is, which i have never seen one .223 chambered. Ive never seen anyone in my area (Huge Coyote/Coy dog hunting area) using a .223 boltgun. Most opt for .243-.308 (Deer hunting is also big). Perhaps its a regional thing.

It the AR platform it is, which i have never seen one .223 chambered. Ive never seen anyone in my area (Huge Coyote/Coy dog hunting area) using a .223 boltgun. Most opt for .243-.308 (Deer hunting is also big). Perhaps its a regional thing.

Right, varmint hunting like prairie dogs. Predator hunting (coyotes) people use bigger calibers like you mentioned if they do not save fur, .223 /5.56 very popular for coyotes too.